If anyone uses Nik Collection with ACDSee Ultimate 2023, just to let you know that when installing Nik Collection 5.2 that Ultimate can only see Dfine2, HDR Efex Pro2, Perspective Efex, Sharpener Pro 3, and Viveza. I reverted to 5.1 and all is well again. So I recommend NOT updating to 5.2 if you use it with ACDSee Ultimate. Unless anyone has any ideas?